
36 Principles of Sustainable Energy Systems
© 2008 Taylor & Francis Group, LLC
effort, together with the growth of the energy retrot industry, could deliver demand
reduction in the range of 2 kW per household—260,000 MW, or more than twice the total
current U.S. nuclear generation capacity. Each year, 1.5–2 million new housing units are
built in the United States. It is vital that every new home built use passive solar design and
the highest energy efciency standards. Water-efcient xtures and faucets would also
reduce demand for natural gas. The installation of a solar heating, and particularly a solar
PV system, would not be economicall